What is the nature of V versus T graph according to Charles’ law.
The V versus T graph according to Charles' law is a straight line.
Question ID: 249
Uploaded on: September 22, 2024
Write whether the following statement is true or false : Among copper, invar and iron the linear expansion coefficient of iron is the lowest. OR What is the unit of volume expansion coefficient?
False
Explanation:
Among copper, invar, and iron, invar has the lowest linear expansion coefficient, not iron. Invar is a special alloy designed to have very low thermal expansion.
OR
The unit of the volume expansion coefficient is per kelvin (K⁻¹).
Question ID: 250
Uploaded on: September 22, 2024
What is meant by the pole of a spherical mirror?
The pole of a spherical mirror is the geometric centre of the mirror's reflecting surface.
Question ID: 251
Uploaded on: September 22, 2024
Write down one use of x-ray.
One use of X-rays is in medical imaging to diagnose fractures of bones.
Question ID: 252
Uploaded on: September 22, 2024
Name a machine where electrical energy is converted to mechanical energy.
A motor is a machine where electrical energy is converted into mechanical energy.
Question ID: 253
Uploaded on: September 22, 2024
Apart from the live wire, what are the two other wires in the household circuit?
Neutral wire and the earth (or ground) wire.
Question ID: 254
Uploaded on: September 22, 2024
Which kind of nuclear reaction produces energy in a nuclear reactor? OR Give an example of a natural radioactive element.
Nuclear Fission is the kind of nuclear reaction that produces energy in a nuclear reactor.
OR
A natural radioactive element is Uranium-238 (U - 238).
Question ID: 255
Uploaded on: September 22, 2024
Match the right column with the left column : [1 × 4]
Left column
Right column
2.11.1. A transuranic element
(a) Krypton
2.11.2. A noble element
(b) Neptunium
2.11.3. Prepared by carbon reduction of the oxide of the metal
(c) Copper
2.11.4 In the alloy brass, the metal whose percentage amount is higher than that of the other metal
(d) Zinc
2.11.1. A transuranic element - (b) Neptunium
2.11.2. A noble element - (a) Krypton
2.11.3. Prepared by carbon reduction of the oxide of the metal - (d) Zinc
2.11.4. In the alloy brass, the metal whose percentage amount is higher than that of the other metal - (c) Copper
Question ID: 256
Uploaded on: September 22, 2024
Between chloroform and sodium chloride which is not soluble in water.
Chloroform is not soluble in water. Sodium chloride (table salt) is highly soluble in water.
Question ID: 257
Uploaded on: September 22, 2024
Name a metal which is extracted by the process of electrolysis. OR Which is the anode in the electroplating of silver on a brass spoon?
A metal that is extracted by the process of electrolysis is sodium.
OR
The anode in the electroplating of silver on a brass spoon is the silver electrode.
Question ID: 258
Uploaded on: September 22, 2024
Which energy causes chemical reaction during electrolysis?
The energy that causes chemical reactions during electrolysis is electrical energy.
Question ID: 259
Uploaded on: September 22, 2024
Show by the help of an appropriate litmus paper that the aqueous solution of ammonia is alkaline in nature. OR Fill up the blank : NaOH + __ H2S -> __ + H2O
When you add red litmus paper to an aqueous solution of ammonia, it turns blue, indicating that the solution is alkaline in nature.
OR
NaOH + H2S → Na2S + H2O
Question ID: 260
Uploaded on: September 22, 2024